The invention provides novel compounds of formula (I)
or a pharmaceutically acceptable salt thereof, wherein R
1
to R
7
are as described herein, compositions including the compounds and methods of preparing and using the compounds.
The invention provides novel compounds of formula (I)
or a pharmaceutically acceptable salt thereof, wherein R1 to R7 are as described herein, compositions including the compounds and methods of preparing and using the compounds.
A compound of formula (I) or a pharmaceutically acceptable salt thereof, wherein R1 to R7 have the significance given in claim 1, can be used in the form of a pharmaceutical composition.